Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Lecanoromycetes O.E. Erikss. & Winka (1997)
       Subclass Ostropomycetidae V. Reeb, Lutzoni & Cl.Roux (2004)
         Order Trichotheliales Hafellner & Kalb (1995) see Order Ostropales Nannf. (1932)
           Family Porinaceae Rchb. (1828)
             Genus Polycornum Malcolm & Vězda (1995)